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Simplifying 2r + -9r + -12 = 16 Reorder the terms: -12 + 2r + -9r = 16 Combine like terms: 2r + -9r = -7r -12 + -7r = 16 Solving -12 + -7r = 16 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + -7r = 16 + 12 Combine like terms: -12 + 12 = 0 0 + -7r = 16 + 12 -7r = 16 + 12 Combine like terms: 16 + 12 = 28 -7r = 28 Divide each side by '-7'. r = -4 Simplifying r = -4
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